Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D471/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00
  • C07D471/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00 in which the condensed system contains two hetero rings
  • C07D471/06—Peri-condensed systems
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/33—Heterocyclic compounds
  • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
  • A61K31/435—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with one nitrogen as the only ring hetero atom
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P35/00—Antineoplastic agents
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P35/00—Antineoplastic agents
  • A61P35/04—Antineoplastic agents specific for metastasis

Definitions

• the present invention relates to 2-[2-[(2-hydroxy- ethyl)amino]ethyl]-5-[[2-methylamino)ethyl]amino]indazo- lo[4,3-gh]isoquinolin-6(2H)-one and the pharmaceutically acceptable acid addition salts thereof.
• This compound has shown a high antitu or activity.
• Mitoxantrone is a broad spectrum oncolytic agent, whose activity is similar to that of the anthracycline antibiotic doxorubicin. Clinical trials have demonstrated that mitoxantrone has particularly promising activity in the treatment of advanced breast cancer, acute leukemia and lymphoma (Legha, Dru ⁇ s of Today, (1984), 2JD, 629).
• the limiting aspect of these medicaments is the cardiotoxicity, particularly with mitoxantrone, and the mielodepressive toxic effect of both of them.
• both compounds show cross-resistance towards the cell histotypes developing resistance already against doxorubicin, said resistance being mediated by over- expression of glycoprotein P.
• Such a resistance which is named ultidrug resistance, involves a number of antitumor antibiotics, among which amsacrine and po- dophyllotoxin and derivatives, and it is one of the main reasons for therapeutical failures in the treatment of solid tumors with said antibiotics.
• EP-A 103,381 claims 2-aminoalkyl- 5-aminoalkylamino anthra[l,9-cd]pyrazol-6(2H)-ones (an- thrapyrazoles) with antitumor activity.
• the antitumor activity of said compounds in pre-clinic trials has been reported by H.D. Hollis Showalter et al. (J. Med. Chem. , 30, 121-131 (1987)).
• anthrapyrazoles are not devoid of toxic side-effects, such as severe leukopenia (W.H.O. grade 3 and 4) and neutropenia (W.H.O. grade 4) which turned out to be dose-limiting in clinical trials of phase I and II with anthrapyrazole CI-941 [I.E.Smith et al., J. Clin. Oncol., 9, 2141-2147 (1991)].
• a marked nephrotoxicity is associated with the treatment with CI- 941 in the rat [D. Campling e M.E.C. Robbins, Nephrotoxicity, Peter H. Dekker Bach and., Pag. 345-352 (1991), New York: vedi Chem.
• an anthrapyrazole 9-aza- analogou ⁇ 2-[2-[(2-hydroxyethyl)amino]ethyl]-5-[[2-(me- thyla ino)ethyl]amino]indazolo[4,3-gh]isoquinolin-6(2H)- one, has a surprising activity which makes it markedly different from the other derivatives of this series.
• Said compound in fact, in addition to an higher increase in the average survival time of the treated animals (expressed as % T/C) than that obtained with its analogues, has moreover evidenced a complete regression of the tumor in a statistically significant number of animals and therefore it is believed to be effective in clinical trials. Disclosure of the invention
• the present invention relates to 2-[2-[(2-hy- droxyethyl)amino]ethyl]-5-[ [2-methylamino)ethyl]amino]- indazolo[4,3-gh]isoquinolin-6(2H)-one of formula (I) and the pharmaceutically acceptable acid addition salts thereto
• Examples of pharmaceutically acceptable acids are: inorganic acids such as hydrochloric, hydrobromic, sulfuric, nitric, phosphoric, pyrophosphoric acids or organic acids such as acetic, trifluoroacetic, propionic, citric, benzoic, lactic, maleic, malic, fumaric, succinic, tartaric, glutamic, aspartic, gluconic, ascorbic, p-toluenesulfonic, methanesulfonic acids or other conventionally used acids.
• inorganic acids such as hydrochloric, hydrobromic, sulfuric, nitric, phosphoric, pyrophosphoric acids
• organic acids such as acetic, trifluoroacetic, propionic, citric, benzoic, lactic, maleic, malic, fumaric, succinic, tartaric, glutamic, aspartic, gluconic, ascorbic, p-toluenesulfonic, methanesulf
• the invention relates to 2-[2- [(2-hydroxyethyl)amino]ethyl]-5-[[2-methylamino)ethyl]- amino]indazolo[4,3-gh]isoquinolin-6(2H)-one trihydro- chloride.
• the compound of the invention can be prepared starting from the intermediate of formula (II):
• a preferred method for the synthesis of the compound of formula (I) is that involving the reaction of the intermediate of formula (II'): with an hydrazine of formula (III) and then with an amine of formula (V) and the subsequent cleavage of any protective groups P and P' present.
• protective groups P and P' are: derivatives (preferably acetyl), (C ⁇ -C 4 )-alkoxycarbonyl derivatives (preferably tert-butoxycarbonyl) and (Cy-C ⁇ )- aralkyloxy-carbonyl derivatives (preferably benzyloxy- carbonyl) .
• the reaction of the intermediates of formula (II) with the hydrazines of formula (III) can be carried out heating the intermediates (II) with a stoichiometric amount or with an excess of hydrazines (III).
• the reaction is usually carried out in a inert solvent such as methylene chloride, chloroform, 1,1,1-tricloroethane, dimethoxyethane, tetrahydrofuran, dimethylsulfoxide, di ethylformamide, pyridine, picoline, alcohols (methanol, ethanol) or in mixtures thereof (alternatively, the compounds (III) can be used alone as the solvent), in presence of an optional inorganic base such as an alkali or alkaline-earth metal carbonate or hydrogen carbonate or an organic base such as trialkyla ine, at a temperature ranging between -20°C and the solvent boiling temperature.
• an optional inorganic base such as an alkali or alkaline-earth metal carbonate
• the reaction is carried out in a solvent such as pyridine, tetrahydrofuran, dimethylsulfoxide or N,N,N' ,N'-tetra- methylethylenediamine, using 2 to 10 equivalents of hydrazines (III) and operating at a temperature ranging between 5'C and 50"C.
• a solvent such as pyridine, tetrahydrofuran, dimethylsulfoxide or N,N,N' ,N'-tetra- methylethylenediamine
• the reaction of the intermediate of formula (II 1 ) with the hydrazines of formula (III) can be carried out preferably in a solvent capable of dissolving the reagents, such as a mixture of tetrahydro uran and of an alcohol (ethanol, methanol), and a temperature ranging between -10"C and room temperature.
• a solvent capable of dissolving the reagents such as a mixture of tetrahydro uran and of an alcohol (ethanol, methanol), and a temperature ranging between -10"C and room temperature.
• the reaction of a compound of formula (IV) with an amine of formula (V) can be carried out heating the compound (IV) with a stoichiometric amount or with an excess of amine (V).
• the reaction is usually carried out in an inert solvent such as methylene chloride, chloroform, 1,1,1-tricloroethane, dimethoxyethane, te ⁇ trahydrofuran, dimethylsulfoxide, dimethylformamide, pyridine, picoline or mixtures thereof or, if desired, using the amine (V) itself as the solvent, optionally in the presence of an inorganic base such as an alkali or alkaline-earth carbonate or hydrogen carbonate or of an inorganic base such as a trialkylamine, at a temperature ranging between 0 * C and the solvent boiling temperature.
• an inert solvent such as methylene chloride, chloroform, 1,1,1-tricloroethane, dimethoxyethane, te ⁇ trahydrofuran, dimethylsulfoxide, dimethylformamide, pyridine, picoline or mixtures thereof or, if desired, using the amine (V) itself as the solvent, optionally in the presence of
• reaction is carried out in a solvent such as pyridine, chloroform or dimethylsulfoxide, using 2 to 10 equivalents of amine (V) and operating at a temperature ranging between room temperature and 100°C.
• a solvent such as pyridine, chloroform or dimethylsulfoxide
• reaction of an intermediate of formula (IV) in which U is OTs with an amine of formula (V) can be carried out in solvents such as pyridine or dimethylsulfoxide and a temperature ranging between room temperature and 100"C.
• solvents such as pyridine or dimethylsulfoxide and a temperature ranging between room temperature and 100"C.
• cleavage of any protective groups P and P' can be carried out according to procedures well-known to those skilled in the art, such as for example those described in Green, T.W. , Wuts, P.G.M. , "Protective
• the cleavage of a N-tert-butoxy- carbonyl group can be obtained by treatment of the protected intermediate with an excess of anhydrous hydrogen chloride, in a solvent such as ethanol, methanol, dichloromethane, chloroform or mixtures thereof, at a temperature ranging between 20 * C and 50'C and for a reaction time comprised between a few minutes and some hours .
• a solvent such as ethanol, methanol, dichloromethane, chloroform or mixtures thereof
• the compound of formula (II' ) can be prepared starting from the compound (VI):
• the mixture of regioisomers (Vila) and (Vllb) can be obtained reacting the intermediate (VI) with l-lithium-2,5-difluorobenzene, prepared by reaction of 1,4-difluorobenzene with an alkyl-lithium such as sec-butyl lithium in THF at low temperature.
• Said reaction can be carried out in an inert solvent such as an ether (THF) and at temperature between -10 * C and room temperature; (d) hydrolysis of the intermediate (XI) methyl ester to give the corresponding acid derivative.
• an alkali metal hydroxide for example, sodium hydroxide
• aqueous and/or alcohol medium and at temperatures ranging between room temperature and the boiling temperature of the solvent or of the mixture of solvents;
• step (b) reaction of ⁇ -bromo-2-chloro-5-fluorotoluene obtained in step (a) in tetrahydrofuran with activated zinc; subsequent reaction of the resulting organo zinc with N-phenoxycarbonyl nicotinium chloride (obtained in turn from methyl nicotinate by acylation with phenylchlorofor ate in tetrahydrofuran), to obtain the interm
• Said reaction can be carried out at temperatures ranging between -5 ⁇ C and room temperature.
• the compound of formula (VI) can be obtained starting from 3,4-pyridine-dicarboxylic acid (commer- cially available) by reaction with a suitable dehy ⁇ drating agent, such as a carboxylic acid anhydride (acetic or trifluoroacetic anhydride), a carbodiimide (N,N'-dicyclohexylcarbodiimide) or similar reagents.
• a suitable dehy ⁇ drating agent such as a carboxylic acid anhydride (acetic or trifluoroacetic anhydride), a carbodiimide (N,N'-dicyclohexylcarbodiimide) or similar reagents.
• a preferred method is the treatment of 3,4- pyridine-dicarboxylic acid with acetic anhydride at about llO'C.
• the salts of the compound of formula (I) can be converted one into another according to conventional methods, well known to those skilled in the art. Biological activity of the compound of the invention.
• the compound of the invention has shown an activity comparable to doxorubicin.
• P 388 Murine leukemia cells were intravenously (iv) injected in CD2F1 mice. Treatment was initiated approximately 24 hours after tumor transplantation and dosages of the product were administered iv according to preestablished protocols, usually at 3-day intervals. The studies were done over a 60 day period and the date of death for each animal was recorded. The % T/C was determined using the median survival time (MST) for each group according to the formula
• T/C% [(MST treated )/(MST controls )] x 100
• the compound of the invention turned out to be active in increasing the survival time of the treated animals compared with the controls (untreated animals). Moreover, the compound of the invention proved to be better tolerated than mitoxantrone (Table II). Further n vivo studies of biological activity of the compound of the invention were carried out using two human tumor xenografts, the human breast MX-1 tumor and the ovary tumor A2780 (Table II). The compound of the invention has evidenced an activity equal if not higher than CI-941, expressed as "tumor weight inhibition". The "tumor weight inhibition" can be evaluated as follows:
• TWI% 100-[(average relative weight of the tumor treated /average relative weight of the tumor controls> xl0 °J
• tumor regression it is meant the reduction of the tumor mass measured 30 days after the end of the treatment compared with the tumor starting weight. Complete tumor regression means the disappearance of the tumor mass.
• the compound of the invention is expected to be active in man against leuke ias and solid tumors sensitive to the treatment with antitumor antibiotics and anthracene- diones.
• the compound of the invention can therefore be used as active ingredient in therapeutical compositions for the regression and/or the treatment of tumors in mammals, when administered in amounts ranging between 0.5 and 20 mg/kg body weight.
• a preferred dosage regimen can be between 1 and 18 mg/kg body weight of the mammal. More particularly, a preferred dosage regimen for man could range between 5 and 200 mg/m.2 body area.
• the dosage can be adjusted to be compatible with other treatment regimens, as for example radiotherapy.
• compositions containing the compound of formula ( I ) are comprised within the invention. These pharmaceutical compositions can contain any amount of compound of formula (I) capable of exerting an antitumor activity in mammals against tumor sensitive to the treatment with doxorubicin, anthracenediones and anthrapyrazoles.
• compositions can contain, in addition to the compound of formula (I), pharmaceutically compatible excipients, suitable for any administration route, such as the oral, parenteral, intravenous, endodermic, subcutaneous or topical administrations, in liquid or solid form.
• pharmaceutically compatible excipients suitable for any administration route, such as the oral, parenteral, intravenous, endodermic, subcutaneous or topical administrations, in liquid or solid form.
• An administration route of the compound of formula (I) is the oral one.
• Oral compositions will generally include an inert diluent or a carrier edible. They can be included in gelatin capsules or compressed into tablets. Other oral administration forms are capsules, pills, elixirs, suspensions or syrups.
• the tablets, pills, capsules and similar compositions can contain the following ingredients (in addition to the active ingredient): a binder, such as icrocrystalline cellulose, tragacanth or gelatin; an excipient such as starch or lactose; a disintegrating agent such as alginic acid, primogel, maize starch and the like; a lubricant such as magnesium stearate; a fluidifier such as colloidal silicon dioxide; a sweetening agent such as sucrose or saccharine or a flavouring agent such as mint flavour, methyl salicylate or orange flavour.
• a binder such as icrocrystalline cellulose, tragacanth or gelatin
• an excipient such as starch or lactose
• a disintegrating agent such as alginic acid, primogel, maize starch and the like
• a lubricant such as magnesium stearate
• a fluidifier such as colloidal silicon dioxide
• a sweetening agent such as sucrose or saccharine or
• the active ingredient can be included in solutions or suspensions, which can comprise in addition the following components: a sterile diluent such as water for injections, saline solution, oils, polyethylene glycols, glycerin, propylene glycol or other synthetic solvents; antibacterial agents such as benzyl alcohol; antioxidants such as ascorbic acid or sodium bisulfite; chelating agents such as ethylenedia inotetraacetic acid; buffers such as acetates, citrates or phosphates and agents for adjusting the tonicity of the solution, such as sodium chloride or dextrose.
• the parenteral preparation can be included in ampoules, mono-dose syringes, glass or plastic vials.
• a solution of the mixture of (Vila) and (Vllb) from preparation 2 (61.07 g) in oleum (20% S0 3 , 100 ml) is heated at 140 ⁇ C and further oleum is added in four portions (13.2 ml each) at 20 minute intervals. After the last addition, the mixture is heated for a further 20 minutes, then is cooled at room temperature and added with a mixture of ice (1500 ml), water (1500 ml) and 35% sodium hydroxide (350 ml). The mixture is extracted with methylene chloride (1x1000 ml followed by 3x500 ml).
• the separated solid is filtered and washed with 100 ml of THF, then it is suspended in water (80 ml), left overnight under stirring and filtered again to give 9.3 g of crude product, which is suspended in methylene chloride (45 ml) and refluxed for 30 minutes. After cooling at room temperature, the product is filtered and the separated solid is washed with methylene chloride (5x3 ml), then dried under vacuum at 40 ⁇ C, to obtain 8.65 g of pure product, m.p. 248-250 * C.
• a mixture of 29 g of 9-fluoro-6-methoxybenzo[g]iso- quinolin-5,10-dione in 145 ml of methanesulfonic acid is heated at llO'C, with stirring and under inert gas atmosphere, for about 2 hours, then added to 3000 ml of water. After 1 hour under stirring, the formed precipitate is filtered, washed with about 300 ml of water, taken up into a further 2000 ml of water and, after stirring for 30 minutes, filtered again. The mother liquors are extracted with 500 ml of ethyl acetate. The organic phase is separated and the solvent is evaporated under reduced pressure.
• PREPARATION 8 2-[2-[N-[ (1,1-dimethylethoxy)carbonyl]- N-(2-hydroxyeth ⁇ l)amino]ethyl]-5-(p-toluenesulfonyloxy)- isoquino[8,7,6,-cd]indazolo-6(2H)-one
• the residue is partitioned between 25 ml of 0.1 N sodium hydroxide and 75 ml of methylene chloride, then the aqueous phase is extracted with methylene chloride (2x25 ml). The combined organic phases are washed twice with brine (25 ml), dried over sodium sulfate and the solvent is evaporated under reduced pressure, to obtain about 2 g of a brown oil.
• the residue is purified by silica gel chromatography (50 g; eluent methylene chloride/methanol/ammonium hydroxide 95:5:0 - 85:15:0.6) and by subsequent crystallization from methylene chloride/methyl tertbutyl ether, to obtain 339 mg of product. m.p.

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